Planet-9

Should the rear speakers work with an aftermarket head unit?

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YOUR RESEARCHShould the rear speakers work with an aftermarket head unit?

Leading reported evidence

Use left and right rca

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No successful repair reported for this finding.

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Unsuccessful attempts: 1
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Suggestion
If it's just using left and right RCA, then it's probably only telling the amp a basic 2 channel output that would be front speakers only.
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Should the rear speakers work with an aftermarket head unit?

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Leading evidence: 'Use left and right rca' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use left and right rca' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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1 matching discussions · 3 captured posts examined · 1 partial discussions

Frequently discussed actions (1)

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Use left and right rca

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
If it's just using left and right RCA, then it's probably only telling the amp a basic 2 channel output that would be front speakers only.
Original post Read captured discussion
Should the rear speakers work with an aftermarket head unit?

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

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Generation: 20261027T140027Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

I replaced my PCM with Bose with a Kenwood head unit that does CarPlay and Android Auto . The rear speakers don't seem to work. I thought the Kenwood had a pre-amp out that connected to the Bose amp and subwoofer. Shouldn't the Bose amp power all speakers in the car? I can fade left/right but not front/rear. I'm not sure the front center speaker works either, but it's kinda hard to put my ear up there to isolate just that speaker.

POST 2Original post

It really depends on whatever adapter is being used to talk to the amp via MOST. If it's just using left and right RCA, then it's probably only telling the amp a basic 2 channel output that would be front speakers only.

POST 3Original post

Interesting, thanks. I had no idea there were more than one kind of adapter. Is it possible to switch adapters and get the rear speakers working? This one claims to retain all speakers, and it only seems to have two RCA cables. https://avinusa.com/most-fiber-optic-amp-interface-for-porsche-cayenne-cayman-boxster.html

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